$ httpBackend.verifyNoOutstandingExpectation（）

Question

我最近开始使用Karma + Karma-jasmine编写单元测试，但我遇到以下测试问题：

describe("WEBSERVICE:", function () {

    var webservice,
        $httpBackend,
        authRequestHandler,
        webserviceURL = "http://localhost:8006/";


    beforeEach(inject(function (Webservice, $injector) {
        webservice = Webservice;
        $httpBackend = $injector.get("$httpBackend");


        authRequestHandler = $httpBackend
            .when("GET", webserviceURL + "users/login")
            .respond(200, "ok");
    }));


    afterEach(function() {
        $httpBackend.verifyNoOutstandingExpectation();
        $httpBackend.verifyNoOutstandingRequest();
    });


    it("should EXISTS", function () {
        expect(webservice).toBeDefined();
    });


    it("should throw a WebserviceError if we are not logged in" , function () {
        expect(function () {
            webservice.item("negs", "RPT");
        }).toThrow(webserviceAuthenticationError);
    });


    it("should NOT HAVE credentials when instantiated", function () {
        expect(webservice.hasCredentials()).toBeFalsy();
    });


    it("should log in when valid credentials are given", function () {
        $httpBackend.expectGET("users/login");
        webservice.withCredentials("sam", "password");
    });
});

似乎以下是产生问题的原因，因为当我删除它时所有测试都通过了：

afterEach(function() {
    $httpBackend.verifyNoOutstandingExpectation();
    $httpBackend.verifyNoOutstandingRequest();
});

我只是想知道是否有人可以帮助我。 非常感谢。